CN110206663B - Method for operating an internal combustion engine, internal combustion engine and vehicle - Google Patents
Method for operating an internal combustion engine, internal combustion engine and vehicle Download PDFInfo
- Publication number
- CN110206663B CN110206663B CN201910149973.4A CN201910149973A CN110206663B CN 110206663 B CN110206663 B CN 110206663B CN 201910149973 A CN201910149973 A CN 201910149973A CN 110206663 B CN110206663 B CN 110206663B
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- internal combustion
- combustion engine
- flushing gas
- gas line
- oxygen content
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
- B60K15/00—Arrangement in connection with fuel supply of combustion engines or other fuel consuming energy converters, e.g. fuel cells; Mounting or construction of fuel tanks
- B60K15/03—Fuel tanks
- B60K15/035—Fuel tanks characterised by venting means
- B60K15/03504—Fuel tanks characterised by venting means adapted to avoid loss of fuel or fuel vapour, e.g. with vapour recovery systems
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
- B60K15/00—Arrangement in connection with fuel supply of combustion engines or other fuel consuming energy converters, e.g. fuel cells; Mounting or construction of fuel tanks
- B60K15/03—Fuel tanks
- B60K15/035—Fuel tanks characterised by venting means
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
- B60K15/00—Arrangement in connection with fuel supply of combustion engines or other fuel consuming energy converters, e.g. fuel cells; Mounting or construction of fuel tanks
- B60K15/03—Fuel tanks
- B60K15/035—Fuel tanks characterised by venting means
- B60K15/03519—Valve arrangements in the vent line
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B77/00—Component parts, details or accessories, not otherwise provided for
- F02B77/04—Cleaning of, preventing corrosion or erosion in, or preventing unwanted deposits in, combustion engines
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/0025—Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
- F02D41/003—Adding fuel vapours, e.g. drawn from engine fuel reservoir
- F02D41/0032—Controlling the purging of the canister as a function of the engine operating conditions
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/0025—Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
- F02D41/003—Adding fuel vapours, e.g. drawn from engine fuel reservoir
- F02D41/0045—Estimating, calculating or determining the purging rate, amount, flow or concentration
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/14—Introducing closed-loop corrections
- F02D41/1438—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M25/00—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture
- F02M25/08—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture adding fuel vapours drawn from engine fuel reservoir
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M25/00—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture
- F02M25/08—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture adding fuel vapours drawn from engine fuel reservoir
- F02M25/0836—Arrangement of valves controlling the admission of fuel vapour to an engine, e.g. valve being disposed between fuel tank or absorption canister and intake manifold
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B77/00—Component parts, details or accessories, not otherwise provided for
- F02B77/04—Cleaning of, preventing corrosion or erosion in, or preventing unwanted deposits in, combustion engines
- F02B2077/045—Cleaning of, preventing corrosion or erosion in, or preventing unwanted deposits in, combustion engines by flushing or rinsing
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M25/00—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture
- F02M25/08—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture adding fuel vapours drawn from engine fuel reservoir
- F02M25/089—Layout of the fuel vapour installation
Abstract
The invention relates to a method for ventilating a tank system of an internal combustion engine, wherein the tank system comprises at least a tank 10, a fuel vapor filter 14 which is in fluid communication with an ambient port 44, a ventilation line 12 which leads from the tank 10 to the fuel vapor filter 14, a purge gas line 16 which leads from the fuel vapor filter 14 to a fresh gas line 18 of the internal combustion engine, and a purge gas supply device 46 which is integrated in the purge gas line 16. The internal combustion engine furthermore comprises an exhaust gas line 26 with an oxygen content sensor 56 integrated therein. The control of the flushing gas supply device 46 is carried out as a function of the measurement signal of the oxygen content sensor 56 in order to regulate the flow of flushing gas in the flushing gas line 16. The method can be advantageously applied in an internal combustion engine additionally comprising an oxygen content regulator 48. Since such an internal combustion engine should essentially comprise the oxygen content sensor 56 for the operation of the oxygen content regulator 48, the method according to the invention makes it possible to regulate the ventilation of the tank system of the internal combustion engine without further sensor devices, which has a favorable effect on the costs for producing such an internal combustion engine.
Description
Technical Field
The invention relates to a method for operating an internal combustion engine having a tank system comprising a tank ventilation valve. The invention also relates to an internal combustion engine suitable for carrying out such a method and to a vehicle having such an internal combustion engine.
Background
Tank systems for internal combustion engines of vehicles usually have a ventilation line which can vent the tank of the tank system into the environment on the basis of the rising pressure of the fuel which vaporizes, for example, at high ambient temperatures. In this case, it is also necessary for emission standards to prevent fuel vapors from entering the environment as far as possible. This is avoided by integrating a fuel vapor filter, usually in the form of an activated carbon filter, which absorbs fuel vapors, in the ventilation line.
For the regeneration of the fuel vapor filter, the tank system is additionally provided with a flushing gas line which is connected on the one hand to the fuel vapor filter and on the other hand to a fresh gas line of the internal combustion engine. During operation of the internal combustion engine, ambient air can be drawn in through an ambient opening of the fuel vapor filter temporarily by means of a negative pressure which is formed in the region of the fresh gas line which opens into the purge gas line compared to the ambient pressure, said ambient air flowing through the fuel vapor filter in the opposite direction to the flow direction of the fuel vapor from the tank to the fuel vapor filter and thereby flushing the fuel vapor filter. The fuel vapor originating from the fuel vapor filter is therefore fed via the fresh gas line into the combustion chamber of the internal combustion engine.
DE 4401887 a1 discloses the regulation of the flushing gas flow in the flushing gas line of a tank system by means of a regulating valve as a function of a measurement signal of an oxygen content sensor (lambda sensor) integrated in the exhaust line of the respective internal combustion engine.
Document DE 102011086946 a1 describes an internal combustion engine supercharged by means of a compressor, having an oil tank system which can be ventilated by means of two flushing gas lines, wherein a first flushing gas line, which integrates a ventilation valve, opens into a section of the fresh gas line downstream of the compressor, and a second flushing gas line, which comprises a flushing gas supply, opens into a section of the fresh gas line upstream of the compressor. The load of the fuel vapor filter of the tank system is detected from the measurement signal of the oxygen content sensor.
Disclosure of Invention
The object of the present invention is to provide an advantageous method for ventilating a tank system of an internal combustion engine.
The object is achieved by a method for ventilating a tank system of an internal combustion engine. The present invention will be described below.
According to the invention, a method for ventilating a tank system of an internal combustion engine is specified, wherein the tank system comprises at least
-a fuel tank,
-a fuel vapor filter in fluid communication with an ambient vent,
a ventilation line leading from the tank to the fuel vapor filter,
a flushing gas line leading from the fuel vapor filter to a fresh gas line of the internal combustion engine, and
a flushing gas delivery device, so-called flushing gas pump, integrated in the flushing gas line.
The internal combustion engine furthermore comprises an exhaust gas line with an oxygen content sensor integrated therein. According to the invention, the control of the flushing gas supply device is carried out as a function of the measurement signal of the oxygen content sensor in order to regulate the flow of flushing gas in the flushing gas line.
The term "fuel vapor filter" does not necessarily require that it must filter volatile fuel in gaseous form in accordance with the present invention. Instead, the fuel may also have (partially) condensed again during the filtration.
The internal combustion engine according to the invention in one aspect also comprises at least
Preferably a spark-ignition internal combustion engine (e.g. a gasoline engine),
a fresh gas line for introducing fresh gas into the internal combustion engine,
an exhaust line comprising an oxygen content sensor for conducting exhaust gases from the internal combustion engine, and
-a tank system comprising at least
-a fuel tank,
-a fuel vapor filter in fluid communication with an ambient vent,
a ventilation line leading from the tank to the fuel vapor filter,
a purge gas line leading from the fuel vapor filter to a fresh gas line of the internal combustion engine,
a purge gas delivery device integrated in the purge gas line.
The internal combustion engine according to the invention furthermore has a control device which is designed to carry out the method according to the invention in an automated manner.
The method according to the invention can be implemented particularly advantageously in an internal combustion engine, as is also preferably specified for an internal combustion engine according to the invention, which further comprises an oxygen content regulator, which relates to a device or software-technology means that regulates the amount of fuel injected into one or more combustion chambers of the internal combustion engine as a function of the measurement signal of the oxygen content sensor, in order to adjust a fuel-to-oxygen ratio, which is defined in spark-ignition internal combustion engines and which is generally in accordance with, for example, stoichiometry, as a function of the oxygen that is also injected into the combustion chambers via fresh gas. Since such internal combustion engines for the operation of such oxygen regulators essentially comprise an oxygen content sensor, the method according to the invention makes it possible to regulate the ventilation of the tank system of the internal combustion engine without further sensor devices, which has a favorable effect on the costs for producing such internal combustion engines.
According to a preferred embodiment of the internal combustion engine according to the invention, the internal combustion engine further comprises a control valve (so-called tank ventilation valve) integrated in the flushing gas line. The method for ventilating a tank system of such an internal combustion engine may preferably comprise, as a function of the measurement signal of the oxygen content sensor, controlling a regulating valve in order to regulate the flow of flushing gas in the flushing gas line or the flow of flushing gas injected into the fresh gas line. If both the flushing gas supply device and the regulating valve are controlled on the basis of the measurement signals of the oxygen content sensor in order to set a defined flow rate of flushing gas in the flushing gas line or to set the quantity of flushing gas originating from the flushing gas line which is transferred into the fresh gas line of the internal combustion engine, the quantity of flushing gas injected into the fresh gas line can be metered particularly precisely, which is advantageous for achieving a defined fuel-to-oxygen ratio of the fuel-air mixture injected into one or more combustion chambers of the internal combustion engine and thus advantageous operation of the internal combustion engine with as high an efficiency as possible and with as low a pollutant emission as possible.
According to a preferred embodiment of the method according to the invention, it can be provided that for controlling the flushing gas supply and/or the regulating valve, the absolute value of the measurement signal of the oxygen content sensor and/or a correction value derived therefrom for an oxygen content regulator of the internal combustion engine is used.
If the flushing gas supply device and the preferably provided regulating valve are controlled on the basis of the measurement signal of the oxygen content sensor in order to set the flow rate of the flushing gas in the flushing gas line or the quantity of flushing gas transferred into the fresh gas line of the internal combustion engine, it can be provided that the control of the flushing gas supply device and the regulator is carried out independently of one another. Alternatively, however, at least one, preferably each, of the components can also be controlled as a function of the control values of the other components, as a result of which particularly advantageous regulation can be achieved. In particular, it can be provided for the correlated control that the flushing gas supply device is operated at a plurality of drive rotational speed steps and that the control valve is controlled in a control range (for example 0% to 100%), wherein a switch is made from a relatively small drive rotational speed step to a relatively large drive rotational speed step if, during operation of the flushing gas supply device at a relatively small drive rotational speed step, a greater flushing gas demand is detected despite a maximum adjustment of the control valve, or a greater flow rate of flushing gas in the flushing gas line is to be provided.
According to a preferred embodiment of the internal combustion engine according to the invention, the internal combustion engine can comprise a pressure and/or temperature sensor integrated in the flushing gas line. Such pressure and/or temperature sensors may be used in particular for diagnostic purposes and/or for determining the concentration of carbohydrates (HC) in the flushing gas. By additionally taking into account the HC concentration, it can be determined more accurately how much carbohydrate is injected by the flushing gas into the fresh gas line and via the fresh gas line into the combustion chamber of the internal combustion engine, which in turn can be compensated by a corresponding control of the internal combustion engine, in particular with regard to the fuel injected by the injection valve, in order to achieve a most favorable operation of the internal combustion engine.
The internal combustion engine according to the invention can furthermore advantageously have a shut-off valve integrated in the flushing gas line, by means of which, if necessary and appropriate, the flow through the flushing gas line can also be influenced and, in particular, interrupted as a supplement to the control valve. In particular, the shut-off valve makes it possible to cut off the flushing gas line and thus the tank system from the fresh gas line of the internal combustion engine as quickly as possible independently of the control valve.
The internal combustion engine according to the invention may in particular be part of a vehicle. In this case, a gas engine of the internal combustion engine can be provided in particular for directly or indirectly providing the vehicle with drive power. The invention therefore also relates to a vehicle, in particular a vehicle which is wheel-based and not orbiting (preferably a passenger car or a truck), having an internal combustion engine according to the invention.
Drawings
The invention will be explained in more detail below with reference to an embodiment shown in the drawing. In the drawings:
FIG. 1: a schematic diagram of an internal combustion engine according to the invention according to a first embodiment;
FIG. 2: a block diagram illustrating the implementation of the method according to the invention on the basis of the internal combustion engine according to fig. 1 is shown;
FIG. 3: a schematic diagram of an internal combustion engine according to the invention according to a second embodiment;
FIG. 4: a block diagram illustrating the implementation of the method according to the invention on the basis of the internal combustion engine according to fig. 3 is shown;
FIG. 5: a schematic diagram of an internal combustion engine according to the invention according to a third embodiment;
FIG. 6: a schematic diagram illustrating an internal combustion engine according to the present invention according to a fourth embodiment; and
FIG. 7: a schematic view of an internal combustion engine according to the present invention according to a fifth embodiment is shown.
Detailed Description
Fig. 1 shows an internal combustion engine for a vehicle according to the invention, which has a tank system. The tank system comprises a tank 10 which is connected via a ventilation line 12 to a fuel vapor filter 14, which is in particular embodied in the form of an activated carbon filter or can comprise at least one such activated carbon filter. Furthermore, the fuel vapor filter 14 is connected to a fresh gas line 18 of the internal combustion engine via a flushing gas line 16, wherein the flushing gas line 16 opens into the fresh gas line 18 upstream of a charge air compressor 22 integrated in the fresh gas line 18 (based on the flow direction of the fresh gas in the fresh gas line 18 toward the combustion chamber of the internal combustion engine). The charge air compressor 22 is part of an exhaust gas turbocharger which also comprises an exhaust gas turbine 24 integrated in the exhaust line 26 of the internal combustion engine. A throttle 36 is also provided in the charge air section of the fresh gas line 18 between the charge air compressor 22 and the internal combustion engine 20, which throttle divides the charge air section into an upstream section, which is generally referred to as a pressure line, and a downstream section, which is generally referred to as a suction line.
During operation of the internal combustion engine, a mixture quantity is burned in a combustion chamber 28 of the internal combustion engine 20, which is defined in part by a cylinder 30 of the internal combustion engine 20, in a known manner and in a defined sequence, said mixture quantity consisting of fresh gas, which is formed entirely or predominantly from ambient air and is sucked in from the environment via an air filter 52, and fuel which is injected into the combustion chamber 28, for example directly by means of a not shown injection valve, wherein the piston 32, which is guided movably in the longitudinal axis direction in the cylinder 30, is moved by the pressure increase in the combustion chamber 28 which results in this way. The movement of the piston 32 is converted by a connecting rod (not shown) into a rotational movement of a crankshaft (not shown), wherein the guidance of the piston 32 by the crankshaft via the connecting rod also simultaneously leads to a cyclic reciprocating movement of the piston 32. The exhaust gases formed during the combustion of the fresh gas fuel mixture in the combustion chamber 28 are conducted away via an exhaust line 26 and flow through the exhaust gas turbine 24, which results in a rotary drive of the turbine wheel (not shown). The rotation of the turbine wheel is transmitted by means of the shaft 34 to a compressor wheel (not shown) of the charge air compressor 22, whereby the charge air compressor 22 ensures the compression of the fresh gas which is fed to the internal combustion engine 20 via the fresh gas line 18.
The fuel vapor filter 14 of the tank system is connected on its side facing away from the ventilation line 12 and the flushing gas line 16 (in terms of its filtering effect on the fuel vapor) to the ambient gas via an ambient air line 38, for which purpose the ambient air line 38 forms an ambient opening 44.
The fuel tank 10 is partially filled with fuel, wherein a portion of the originally liquid fuel generally evaporates, so that there is also fuel in the fuel tank 10 in a gaseous condensed state. The evaporation of the fuel in the tank 10 is enhanced by the relatively high temperature of the fuel, which is particularly the case when the ambient temperature is relatively high and when the ambient pressure changes (for example due to uphill driving of a vehicle comprising an internal combustion engine). In order to avoid an impermissibly high overpressure in the fuel tank 10 as a result of this evaporation, a pressure compensation with respect to the ambient pressure can be effected via the ventilation line 12 and the fuel vapor filter 14 and via the ambient air line 38, wherein the escape of fuel vapor to the environment as a result of this pressure compensation is prevented by the fuel vapor filter 14.
This ventilation of the fuel tank 10 leads to an increasing saturation of the fuel vapor filter 14, which in turn leads to the fuel vapor filter being intended to be regenerated at regular intervals. For this purpose, a flushing of the fuel vapor filter 14 is provided in that ambient air is sucked in via the ambient air port 44 and the ambient air line 38. Ambient air flows through the fuel vapor filter 14 in the opposite direction to the flow direction when the fuel tank 10 is ventilated, so that fuel molecules adsorbed in the fuel vapor filter 14 are entrained by the ambient air and enter the fresh gas line 18 via the purge gas line 16. Thus, fuel, which typically includes a mixture of a plurality of different carbohydrates, is delivered to a combustion device in the combustion chamber 28 of the internal combustion engine 20.
Such flushing of the fuel vapor filter 14 is only intended to be temporary and always takes place during operation of the internal combustion engine 20, since only then can the fuel injected into the fresh gas line 18 by flushing the fuel vapor filter 14 be reliably delivered to the combustion device in the combustion chamber 28. Conversely, the injection of fresh gas line 18 when internal combustion engine 20 is not operating results in gaseous fuel escaping into the environment via the unsealed part of fresh gas line 18 and in particular via the intake opening of fresh gas line 18.
A control valve or tank ventilation valve 42 is integrated in the flushing gas line 16, which is arranged as close as possible to the port 40 of the flushing gas line 16, which leads into the fresh gas line 18, or is integrated in this port of the flushing gas line.
In order to flush the fuel vapor filter 14, a sufficient pressure drop between the ambient pressure and the pressure of the fresh gas line 18 in the region of the port 40 of the flushing gas line 16 is required, which pressure drop cannot always exist due to the strongly fluctuating pressure in the fresh gas line 18 during operation of the internal combustion engine 20. During operation of the internal combustion engine 20 and therefore of the charge air compressor 22, the pressure of the fresh gas in the section of the fresh gas line 18 in the region of the port 40 of the flushing gas line 16 is generally low, so that there is a sufficient pressure drop compared to the ambient pressure at the ambient port 44. However, this is not always the case.
In order to be able to flush the fuel vapor filter 14 at any time, so that complete saturation thereof can be reliably avoided, the tank system of the internal combustion engine also comprises a flushing gas supply device 46 integrated in the flushing gas line 16, which is often also referred to as a "flushing air pump" and can be designed in the form of a piston compressor, in particular as a vane compressor or as a centrifugal blower. By operating the flushing gas supply device 46, ambient air can be actively drawn in via an ambient port 44, which then flows through the fuel vapor filter 14 for flushing it and is supplied to the port 40 of the flushing gas line 16 via the flushing gas supply device 46 and the at least partially open tank ventilation valve 42. Furthermore, a shut-off valve 54 is integrated in the purge gas line 16 in the section between the fuel vapor filter 14 and the purge gas supply device 46, said shut-off valve having two switching positions. In the first switching position, the flow through the flushing gas line 16 is completely blocked by the shut-off valve 54, while in the second switching position the shut-off valve opens this flow as wide as possible.
At least the flushing gas feed device 46, the tank ventilation valve 42, the shut-off valve 54, the throttle valve 36 and the injection valve can be controlled by means of a control device 48 (for example an engine control unit of an internal combustion engine). At the same time, the control device 48 also receives measurement signals from a pressure-temperature sensor 50, which pressure-temperature sensor 50 is integrated in the flushing-gas line 16 in the section between the flushing-gas supply device 46 and the tank ventilation valve 42, and from an oxygen content sensor 56, which oxygen content sensor 56 is integrated in the exhaust line 26 downstream of the exhaust-gas turbine 24. The control device 48 also serves as an oxygen content regulator for the internal combustion engine, for which purpose it determines the amount of fuel to be injected into the combustion chamber 28 in order to maintain, as precisely as possible during operation, a defined, sometimes changing fuel-to-oxygen ratio of the amount of fresh fuel gas mixture that is burned in the combustion chamber 28.
Fig. 2 shows a block diagram of the functional relationships for carrying out the method according to the invention for ventilating a tank of the internal combustion engine according to fig. 1.
Fig. 2 shows that the exhaust gas formed when the fuel fresh gas mixture quantity is combusted in the combustion chamber 28 flows around an oxygen content sensor 56 integrated in the exhaust line 26, which then forms a measurement signal, which reflects the proportion of the remaining oxygen in the exhaust gas. This measurement signal is transmitted to the control device 48, which uses it both in its function as an oxygen content regulator 48a and in its function as a regulating device 48b for tank ventilation or for controlling the flushing gas supply device 46, the tank ventilation valve 42 and the shut-off valve 54. In this case, it can be provided that the control device 48, in its function as a regulating device 48b for tank ventilation, uses not only the absolute value of the measurement signal of the oxygen content sensor 56, but also a correction value determined by the control device 48 in its function as an oxygen content regulator 48a, in order to control the injection valve and the throttle valve 36 again or in a different manner as a function of the measurement signal of the oxygen content sensor 56, in order to maintain a defined fuel-to-oxygen ratio of the amount of fresh fuel gas mixture combusted in the combustion chamber 28. Based on this input value, the control device 48 calculates control signals for flushing the gas supply device 46 and the tank ventilation valve 42 in its function as a regulating device 48b for tank ventilation. By means of a corresponding actuation of the flushing gas supply device 46 and a corresponding adjustment of the tank ventilation valve 42, the amount of flushing gas injected into the fresh gas line 18 is influenced, which in turn influences the fuel injected as a whole, i.e. on the one hand via the injection valve and on the other hand by the fresh gas into the combustion chamber 28. The control of the flushing gas supply device 46 and the tank ventilation valve 42 can be carried out independently of one another, in particular by means of a plurality of independent control cycles, or in each case as a function of the respective control values of the various components.
The internal combustion engine shown in fig. 3 corresponds to the internal combustion engine according to fig. 1, with the exception that neither the tank ventilation valve 42 nor the pressure/temperature sensor 50 and the shut-off valve 54 are provided. In the internal combustion engine according to fig. 3, in addition to the pressure ratio between the environment and the fresh gas line 18, an active influence on the flow rate of flushing gas in the flushing gas line 16 can be achieved during tank ventilation, thus only by means of a corresponding control of the flushing gas supply device 46 (see fig. 4).
In contrast, in the internal combustion engine according to fig. 5, in addition to the flushing gas supply device 46, only the tank ventilation valve 42 is integrated into the flushing gas line 16. In contrast to the internal combustion engine according to fig. 1, neither the pressure/temperature sensor 50 nor the shut-off valve 54 is provided. The functional relationship when carrying out the method according to the invention on the basis of such an internal combustion engine according to fig. 5 may correspond to the functional relationship according to fig. 2.
In the internal combustion engine according to fig. 6, in addition to the flushing gas supply device 46, only the shut-off valve 54 is integrated in the flushing gas line 16. In this exemplary embodiment, no additional tank ventilation valve 42 and no pressure/temperature sensor 50 are provided as provided in the internal combustion engine according to fig. 1.
In contrast, in the internal combustion engine according to fig. 7, in addition to the flushing gas supply device 46, only the pressure/temperature sensor 50 is integrated in the flushing gas line 16.
The functional relationship when carrying out the method according to the invention on the basis of such an internal combustion engine according to fig. 6 and 7 may correspond to the functional relationship according to fig. 4.
List of reference numerals
10 oil tank
12 ventilation pipeline
14 fuel vapor filter
16 flushing gas line
18 fresh air line
20 internal combustion engine
22 booster air compressor
24 exhaust gas turbine
26 exhaust line
28 combustion chamber of internal combustion engine
30 cylinder of internal combustion engine
32 piston of internal combustion engine
34 shaft
36 throttle valve
38 ambient air line
40 flushing gas line port
42 regulating valve/tank vent valve
44 ambient vent
46 purge gas delivery apparatus
48 control device
48a control device functioning as an oxygen regulator
48b function of the control device as a regulating device for tank ventilation
50 pressure sensor
52 air filter
54 stop valve
56 oxygen content sensor
Claims (9)
1. Method for ventilating a tank system of an internal combustion engine, the tank system comprising
-a tank (10),
-a fuel vapor filter (14) in fluid communication with an ambient port (44),
-a ventilation line (12) leading from the tank (10) to a fuel vapor filter (14),
-a flushing gas line (16) leading from the fuel vapor filter (14) to a fresh gas line (18) of the internal combustion engine, and
a flushing gas delivery device (46) integrated in the flushing gas line (16),
wherein the internal combustion engine further has an exhaust gas line (26) with an oxygen content sensor (56) integrated in the exhaust gas line, characterized in that the control of the flushing gas delivery device (46) is carried out as a function of a measurement signal of the oxygen content sensor (56) in order to regulate the flow of flushing gas in the flushing gas line (16), wherein the internal combustion engine further comprises an oxygen content regulator involving a device or software-technology means which regulates the amount of fuel injected into one or more combustion chambers of the internal combustion engine as a function of the measurement signal of the oxygen content sensor, in order to adjust a stoichiometric fuel-to-oxygen ratio in the spark-ignited internal combustion engine, defined as a function of the oxygen injected into the combustion chamber also via fresh gas.
2. Method according to claim 1, characterized in that the tank system comprises a regulating valve (42) integrated in the flushing gas line (16), wherein the control of the regulating valve (42) is carried out as a function of the measurement signal of the oxygen content sensor (56) in order to regulate the flow of flushing gas in the flushing gas line (16).
3. Method according to claim 1 or 2, characterized in that for controlling the flushing gas supply device (46) and/or the regulating valve (42), the absolute value of the measurement signal of the oxygen content sensor (56) and/or a correction value derived therefrom for an oxygen content regulator (48b) of the internal combustion engine is used.
4. Method according to claim 2, characterized in that the control of the flushing gas delivery device (46) and the regulating valve (42) is carried out independently of each other or the control of one of the flushing gas delivery device (46) and the regulating valve (42) is carried out in dependence on the control value of the other of the flushing gas delivery device (46) and the regulating valve (42).
5. Method according to claim 4, characterized in that the flushing gas delivery device (46) can be operated at a plurality of drive rotational speed steps and the regulating valve (42) can be controlled within a control range, wherein if during operation of the flushing gas delivery device (46) at a relatively small drive rotational speed step a greater flushing gas demand is detected despite maximum control of the regulating valve (42), a switch is made from operation of the flushing gas delivery device (46) at a relatively small drive rotational speed step to operation at a relatively large drive rotational speed step.
6. An internal combustion engine having
-an internal combustion engine (20),
a fresh gas line (18) for introducing fresh gas into the internal combustion engine (20),
an exhaust line (26) comprising an oxygen content sensor for conducting exhaust gases from the internal combustion engine (20),
-a tank system comprising
-a tank (10),
-a fuel vapor filter (14) in fluid communication with an ambient port (44),
-a ventilation line (12) leading from the tank (10) to a fuel vapor filter (14),
-a flushing gas line (16) leading from the fuel vapor filter (14) to a fresh gas line (18) of the internal combustion engine, and
a flushing gas delivery device (46) integrated in the flushing gas line (16),
and the internal combustion engine is provided with
-a control device (48),
characterized in that the control device (48) is designed to carry out the method according to one of the preceding claims in an automated manner.
7. An internal combustion engine according to claim 6, characterized in that a regulating valve (42) is integrated in the flushing gas line (16).
8. An internal combustion engine according to claim 6 or 7, characterized in that a pressure and temperature sensor (50) is integrated in the flushing gas line (16).
9. Internal combustion engine according to claim 6 or 7, characterized in that a shut-off valve (54) is integrated in the flushing gas line (16).
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102018104622.7 | 2018-02-28 | ||
| DE102018104622.7A DE102018104622A1 (en) | 2018-02-28 | 2018-02-28 | Method for venting a fuel tank system of an internal combustion engine based on the measurement signal of a lambda sensor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110206663A CN110206663A (en) | 2019-09-06 |
| CN110206663B true CN110206663B (en) | 2022-05-13 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910149973.4A Active CN110206663B (en) | 2018-02-28 | 2019-02-28 | Method for operating an internal combustion engine, internal combustion engine and vehicle |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US10913348B2 (en) |
| EP (1) | EP3533985A1 (en) |
| CN (1) | CN110206663B (en) |
| DE (1) | DE102018104622A1 (en) |
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| JP2021038717A (en) * | 2019-09-04 | 2021-03-11 | 愛三工業株式会社 | Evaporated fuel treatment device |
| CN112324567B (en) * | 2020-11-19 | 2021-06-22 | 海飞特(西安)直升机有限公司 | Diversion recovery type engine carbon deposit treatment mechanism and treatment method thereof |
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Also Published As
| Publication number | Publication date |
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| DE102018104622A1 (en) | 2019-08-29 |
| US10913348B2 (en) | 2021-02-09 |
| US20190263258A1 (en) | 2019-08-29 |
| EP3533985A1 (en) | 2019-09-04 |
| CN110206663A (en) | 2019-09-06 |
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